Angular 7 - 重新加载/刷新数据不同的组件 [英] Angular 7 - Reload / refresh data different components

问题描述

组件2发生变化时如何刷新不同组件1中的数据.这两个组件不在同一个父节点下.

customer.service.ts

export class UserManagementService extends RestService {private BASE_URL_UM: string = '/portal/admin';私有标头 = 新的 HttpHeaders({'授权':localStorage.getItem('token'),'内容类型':'应用程序/json'});构造函数(受保护的注入器:注入器，受保护的 httpClient: HttpClient) {超级(注射器)；}getEapGroupList(): Observable <EapGroupInterface >{返回 this.get <组界面 >(this.getFullUrl(`${this.BASE_URL_UM}/groups`), {标头:this.headers});}updateGroup(body: CreateGroupPayload): Observable <CreateGroupPayload >{返回 this.put <组有效载荷 >(this.getFullUrl(`${this.BASE_URL_UM}/group`), 正文, {标头:this.headers});}}

Component1.ts

导出类 UserGroupComponent 实现 OnInit {构造函数(私有 userManagementService:UserManagementService){}ngOnInit() {this.loadGroup();}负载组(){this.userManagementService.getEapGroupList().订阅(响应=> {this.groups = 响应；})}}

<mat-list-item *ngFor="let group of groups?.groupList" role="listitem"><div matLine [routerLink]="['/portal/user-management/group', group.groupCode, 'overview']" [routerLinkActive]="['is-active']">{{group.groupName}}

</mat-list-item><mat-sidenav-content><路由器插座></路由器插座></mat-sidenav-content>

component2.ts

setPayload() {const formValue = this.newGroupForm.value返回 {'id':'5c47b24918a17c0001aa7df4'，'groupName': formValue.groupName,}}onUpdateGroup() {this.userManagementService.updateGroup(this.setPayload()).subscribe(() => {console.log('成功);})}

当我在 component1 中更新 onUpdateGroup() api 时，loadGroup() 应该在 component2

中刷新

解决方案

网上有很多例子，你可以使用Subject"和Output EventEmitter.两者都会起作用.以下示例是共享服务的示例代码.尝试使用它.

@Injectable()导出类 TodosService {私人 _toggle = 新主题()；切换$ = this._toggle.asObservable();切换(待办事项){this._toggle.next(todo);}}导出类 TodoComponent {构造函数(私有 todosService:TodosService){}切换(待办事项){this.todosService.toggle(todo);}}导出类 TodosPageComponent {构造函数(私有 todosService:TodosService){todosService.toggle$.subscribe(..);}}

How to refresh data in different component 1 when changes made in component 2. These two components are not under same parentnode.

customer.service.ts

export class UserManagementService extends RestService {

  private BASE_URL_UM: string = '/portal/admin';

  private headers = new HttpHeaders({
    'Authorization': localStorage.getItem('token'),
    'Content-Type': 'application/json'
  });

  constructor(protected injector: Injector,
    protected httpClient: HttpClient) {
    super(injector);
  }
  getEapGroupList(): Observable < EapGroupInterface > {
    return this.get < GroupInterface >
      (this.getFullUrl(`${this.BASE_URL_UM}/groups`), {
        headers: this.headers
      });
  }

  updateGroup(body: CreateGroupPayload): Observable < CreateGroupPayload > {
    return this.put < GroupPayload >
      (this.getFullUrl(`${this.BASE_URL_UM}/group`), body, {
        headers: this.headers
      });
  }
}

Component1.ts

export class UserGroupComponent implements OnInit {

  constructor(private userManagementService: UserManagementService) {}

  ngOnInit() {
    this.loadGroup();
  }

  loadGroup() {
    this.userManagementService.getEapGroupList()
      .subscribe(response => {
        this.groups = response;
      })
  }

}

<mat-list-item *ngFor="let group of groups?.groupList" role="listitem">
  <div matLine [routerLink]="['/portal/user-management/group', group.groupCode, 'overview']" [routerLinkActive]="['is-active']">
    {{group.groupName}}
  </div>
</mat-list-item>
<mat-sidenav-content>
  <router-outlet></router-outlet>
</mat-sidenav-content>

component2.ts

setPayload() {
  const formValue = this.newGroupForm.value
  return {
    'id': '5c47b24918a17c0001aa7df4',
    'groupName': formValue.groupName,
  }
}

onUpdateGroup() {
    this.userManagementService.updateGroup(this.setPayload())
      .subscribe(() => {
          console.log('success);
          })
      }

When I update onUpdateGroup() api in component1, loadGroup() should refresh in component2

解决方案

There is a lot of example on the web, you can use "Subject" and Output EventEmitter. Both will work. The following example is the sample code of shared service. Try to use it.

@Injectable()
export class TodosService {
  private _toggle = new Subject();
  toggle$ = this._toggle.asObservable();

  toggle(todo) {
    this._toggle.next(todo);
  }
}

export class TodoComponent {
  constructor(private todosService: TodosService) {}

  toggle(todo) {
    this.todosService.toggle(todo);
  }
}

export class TodosPageComponent {
  constructor(private todosService: TodosService) {
    todosService.toggle$.subscribe(..);
  }
}

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